fast_static.cpp

template <typename T>
struct fast_static
{
    // call globally to ensure the constructor is called
    static T& slow_get()
    {
        static T t;
        return t;
    }

    static T* const _fast_var;

    // never call globally!
    // call after entering main to skip sync of local static
    static T& fast_get()
    {
        return *_fast_var;
    }
};

template <typename T>
T* const fast_static<T>::_fast_var = &fast_static<T>::slow_get();